有限转动角的计算和迭加方法与线位移不同。
The method for computing finite rotations is different from that of the translation displacements.
为了方便描述曲梁横截面的有限转动，引入了转角伪矢量的概念。
A rotational pseudovector is introduced for conveniently describing the finite rotations of cross-sections.
借助于四元数理论证明了任意顺序下刚体有限转动合成的可交换性定理。
With the help of the theory of quaternions the theorems of commutativity of composition for the finite rotation of rigid body are proved in the any order.
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